At Mitaka.

I have re-started the assembly of geophone pods for TMS-VISY according to the procedure document. Via the digital system at NAOJ-ATC, the output signal was checked before and after tightening each pod.

But... again the group of the pods include at least one bad pod, and unfortunately I picked up the bad one first ; the bad point was that one of the M8 screw holes was badly manufactured; I found an M8 bolt was about to gall. I tried some ways (including ethanol-dropping) to somehow use this hole as was, but finally gave up and detached the other healthy bolts that were already inserted (actually the about-to-gall one was the final bolt to be inserted...).

Anyway, using another pod, I completed a geophone pod with a horizontal L-4C. This is called geophone H1 for TMS-VISY (#15 geohpone with the driver sn164).

Need to consider how to overcome the bad pod...